Rich_Winsor Posted October 22, 2015 Share Posted October 22, 2015 Or should I say why is it so hard to get good ray trace results? Well I have been doing a lot of ray tracing lately and I think I can put my finger on it now. Ray Tracing is akin to digital alchemy. You are presented with a palate consisting of an incalculable number of possibilities and you are tasked with finding just the right combination of these possibilities to create that “golden” image. I always assumed that there were lots of possible combinations but when I ran some numbers I was flabbergasted. Take the “Image Properties” dbx which is instrumental to all ray traces. Here we have 7 slider bars which each have 100 different selections that range from 0% to 100%. Now I’m no mathematician but to me that works out to making a selection of 7 settings out of a possible 700. So how many possible combinations are we talking about? 1.5 x 10 to the 16th power - Help me out here, is that 15,000,000,000,000,000 ? Holy sh$t! And you can double that number by simply selecting or deselecting the “Use Tone Mapping” option. These of course are global image settings and don’t even start to consider the possibilities of changes to individual item’s characteristics which depending on their Material Class include such as: Diffuse, Specular, Roughness, Emissive, Transparency, Translucency, Reflection or Index of Refraction. And then all of these possibilities can have different colors. Are we getting the picture yet? That is why Ray Tracing is so hard. 1 Link to comment Share on other sites More sharing options...
johnny Posted October 22, 2015 Share Posted October 22, 2015 I am glad you said it, and I agree fully. Although, its good to have lots of control on certain levels - so its a hard balance to make. Perhaps a small preview window where you can see the results in a fraction of the screen size so you can make certain adjustments without needing to go back and forth with actual ray tracing? Its not so much the options, per-se, but the fact you have to fully execute the render to see the results - then rise-repeat to correct. Link to comment Share on other sites More sharing options...
glennw Posted October 23, 2015 Share Posted October 23, 2015 Perhaps a small preview window where you can see the results in a fraction of the screen size so you can make certain adjustments without needing to go back and forth with actual ray tracing? Its not so much the options, per-se, but the fact you have to fully execute the render to see the results - then rise-repeat to correct. Johnny, There are options in the Ray Trace Options dbx to control the size and resolution of the Ray Trace, like Use Active Window Size, size, resolution, etc. You can zoom in to any part of the view and only render that bit as a test at any size and resolution you want. 1 Link to comment Share on other sites More sharing options...
Alaskan_Son Posted October 23, 2015 Share Posted October 23, 2015 Johnny, There are options in the Ray Trace Options dbx to control the size and resolution of the Ray Trace, like Use Active Window Size, size, resolution, etc. You can zoom in to any part of the view and only render that bit as a test at any size and resolution you want. That's a very good suggestion Glenn. Link to comment Share on other sites More sharing options...
glennw Posted October 23, 2015 Share Posted October 23, 2015 Thanks Michael, but I suspect that it won't be enough. 1 Link to comment Share on other sites More sharing options...
Rich_Winsor Posted October 23, 2015 Author Share Posted October 23, 2015 I am glad you said it, and I agree fully. Although, its good to have lots of control on certain levels - so its a hard balance to make. Perhaps a small preview window where you can see the results in a fraction of the screen size so you can make certain adjustments without needing to go back and forth with actual ray tracing? Its not so much the options, per-se, but the fact you have to fully execute the render to see the results - then rise-repeat to correct. Probably stating the obvious here but you can make adjustments in the Image Properties dbx on the fly so to speak and they update in the ongoing ray trace. Also as long as the ray trace window hasn't been closed you can also make adjustments after the ray trace has been stopped. This way you can display 2 ray traces side by side and still make adjustments to either one of them. Link to comment Share on other sites More sharing options...
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